Fix infinite hydration loop and stabilize global store synchronization

- Refactored layouts to derive account data from stable props instead of reactive stores.
- Wrapped store updates in untrack() with deep equality guards to prevent infinite re-renders.
- Resolved duplicate untrack declarations and missing imports across the project.
- Added fetch safeguards to Element_data_store to prevent redundant API calls.
- Standardized hydration patterns to break circular dependencies during initial load.

src/lib/elements/element_data_store_v3.svelte

@@ -156,6 +156,7 @@
     });
 
     async function load_data_store() {
+        if (ds_loading_status === 'loading') return;
         ds_loading_status = 'loading';
         const api_cfg = untrack(() => $ae_api);